HELP - Sia Errorbrowsing

following issue:
I installed Sia UI on MacOS. Created my wallet, and during that I send some SC to my SC-wallet adress whilst the wallet was still synchronizing the blockchain.
For some reason my computer shut down and when I tried to open the Sia UI I get the following ERROR message:
A critical error loading Sia has occured: Siad unexpectedly exited. Error log: Loading...
(0/6) Loading siad...
(1/6) Loading gateway...
(2/6) Loading consensus...
Closing gateway...
panic: invalid page allocation: 0